Notes about the DKX file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The DKX file type is primarily associated with 'Submarine Titans' by Ellipse Studios. Both the subtitans.com and ellipsestudios.com brought up "under construction" pages at the time I checked this. Each zipped battle map includes a .DKD and a .DKX file. When the player downloads the files, they must place them into the Custom folder, located in the root of the Submarine Titans directory. To access these battles, they must go into Solo Game | Battles and choose either one.